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2. Farmers' occupational health program in Finland 1979–1988. From research to practice;Husman;Scand. J. Work Environ. Hlth,1988
3. Cancer among farmers: a review;Blair;Scand. J. Work Environ. Hlth,1985
4. Total concentration of dust in the air during farm work;Louhelainen;Eur. J. Respir. Dis.,1987